Discharge-valve for gas-compressors.



No. 867,702. PATENTBD OCT-. 8, 1907.

' A. P. CLARKE.

DISCHARGE VALVE FDR GAS GOMPRESSORS.

APPLIOATI ON FILED AUG-13, 1906.

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ARTHUR F. CLARKE, OF BUTLER, PENNSYLVANIA.

DISCHARGE-VALVE FOR GAS-COMPRESSORS.

Specification of Letters Patent.

Patented Oct. 8, 1907.

Application filed August 13,1906. Serial No. 330,360.

To all whom it may'concem:

Be it known that I, ARTHUR F. CLARKE, a citizen of the United States ofAmerica, residing at Butler, in the county of Butler and State ofPennsylvania, have invented certain new and useful Improvements inDischarge-Valves for Gas-Compressors, of which the following is aspecification, reference being had therein to the accompanying drawing.

This invention relates to discharge valves for gasor air compressors,and its object is to provide valves of this character with removableseats. Ordinarily in this class of machines, the discharge valve seat isformed by counter-boring the discharge opening of the cylinder, thevalveresting within such counter-bore. This manner of seating the valveis objectionable for the reason that the constant striking thereon ofthe valve, soon unduly wears the seat, necessitating expensive repairsthereto.

The present invention aims to avoid this objection, by providing thedischarge opening of the cylinder with a removable steel bushing, whichwhen worn may be readily removed. and replaced by a new bushing.

The construction of the improvement will be more specifically describedhereinafter in connection with the accompanying drawing which forms apart of this specification and its novel features will be defined in theappended claims.

In the drawing, Figure 1 is a view partly in side elevation, and partlyin vertical section,'of a discharge valve equipped with my improveddetachable valveseat, and Fig; 2 is a bottom plan view of the valve seatremoved from the cylinder wall.

The reference numeral 1 designates a portion of the outer wall of a gascompressor cylinder formed with a threaded opening 2 to receive atubular guide 3 pro vided with a threaded collar 4 fitting the opening2; and having a squared head 5.

The numeral 6 designates the inner wall of the compressor cylinderformed with a discharge opening 7 the wall of which is bored to form anannular shoulder 8 and screw threaded below said shoulder as at 9.

The removable valve seat which constitutes the distinguishing feature ofthe invention, consists of a steel ring or bushing 10 externallythreaded to engage the threads of the discharge opening, and formed withan annular flange 11 adapted to rest upon the shoulder 8, anddiametrically opposite lugs 11.

The upper edge 12 of the removable seat 10 is beveled to adapt it toclosely lit a correspondingly beveled discharge valve 13, the stem 14 ofwhich is hollow and fits within the tubular guide 3. A coil spring 15 isdis posed within this hollow stem, one end of said spring bearingagainst the valve 13 and the opposite end against the head 5 of thetubular guide.

The guide 3 is preferably provided with a small opening 16 to admit asufficient quantity of air to the interior of the guide to cushion themovement of the valve in its descent, and to permit the air compressedby the upward movement of the valve to escape.

The utility of the improvement will be readily understood. The removablesteel bushing may be quickly removed and renewed when worn, and thus thedelay and expense of repairing valve seats when worn, are entirelyavoided.

What I claim and desire to secure by Letters Patent,

The combination with a compressor cylinder having a discharge opening,and a hardened-steel bushing threaded into engagement with the walls ofsaid opening and beveled at its upper end to form a valve seat, atubular guide mounted in the wall of said cylinder, having a closedupper end, a hollow valve-stem mounted to work in said tubular guide andhaving an air inlet port, a valve carried by said valvestem to engagethe valve-seat, and a spring in the va1ve-stem resting at its lower endon the valve and at its upper end engaging the closed upper end of theguide.

ARTHUR F. CLARKE.

Witnesses F. O. MCCLEARY, SAMUEL PAYNE.

